1 Samuel 17:48-49
48-49That roused the Philistine, and he started toward David. David took off from the front line, running toward the Philistine. David reached into his pocket for a stone, slung it, and hit the Philistine hard in the forehead, embedding the stone deeply. The Philistine crashed, facedown in the dirt.
50That's how David beat the Philistine—with a sling and a stone. He hit him and killed him. No sword for David!